WANG Sai,SHI Yu-long,JIANG Qi-hai,et al.Removal Characteristics of Organic Matters from Secondary Effluent by Two Types of Carbon Based Adsorbent[J].China Water & Wastewater,2021,37(5 5):43-50.
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Removal Characteristics of Organic Matters from Secondary Effluent by Two Types of Carbon Based Adsorbent

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第37卷 Number: 5 5 Page: 43-50 Column: Date of publication: 2021-03-01
Author(s):
WANG Sai1; SHI Yu-long2; 3; JIANG Qi-hai2; XU Qi2; 3; TIAN Ya-qi2; 3; LI Kui-xiao2; 3; ZHENG Xiao-ying1
(1. Beijing Key Laboratory of Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China; 2. Beijing Drainage Group Co. Ltd., Beijing 100022, China； 3. Beijing Engineering Research Center of Wastewater Resource, Beijing 100124, China)
Keywords:
activated carbon; activated coke; biological activated coke; secondary effluent; water reclamation plant
Abstract:
In this study, batch adsorption and continuous filtration experiments were conducted to investigate the effectiveness of activated coke and activated carbon for removing organic matters from secondary effluents of water reclamation plant. The activated coke was shown to be a mesoporous structure with macropores and mesopores volume of 0.436 cm3/g, which was 1.6 times higher than that of activated carbon. Kinetic studies revealed that the quasi-second-order kinetic model was more suitable for simulating COD adsorption by two materials, and the adsorption rate constant k2 of COD onto activated coke was twice as high as it for activated carbon at dosage of 1.0 g/L. The saturated adsorption capacity for COD was 230.38 mg/g and 94.14 mg/g using activated coke and activated carbon respectively based on Langmuir isotherm at 22 ℃. Continuous filtration experiments showed that the activated coke filter performed better than the activated carbon filter in organic matters removal during four months operation. The removal efficiency of COD gradually decreased in development of fresh activated coke and activated carbon to biological activated coke and activated carbon, and finally maintained at 28.43% and 22.26% respectively. The total adenosine tri-phosphate (ATP) content of activated coke and activated carbon particles was 7 032.94 ng/g and 5 753.52 ng/g. In addition, activated coke filter obtained an effective removal of organic fractions with molecular weight of 1-10 ku, as well as organic matters with different fluorescent characteristics, such as fulvic acid and soluble microbial products. Compared with activated carbon, activated coke is more effective in organic matters removal from secondary effluents.
Last Update: 2021-03-01